问题:
Which command will need to be added to External_A to ensure that it will take over if serial 0/0 on External_B fails?()
A . standby 1 priority 130
B . standby 1 preempt
C . standby 1 track fastethernet 0/0
D . standby 1 track 10.10.10.1
Which command will need to be added to External_A to ensure that it will take over if serial 0/0 on External_B fails?()
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